Curious to what might be the factors in determaining setting piston heights.(other than manufactures recommendations) I would like to know how this is determained. Is it detemained by the total displacement of oil by the shaft. Is consideration taken of the oil that is being displaced is also being metered by the compression adjusters. I have read that 20% of the volume is a good pecentage on setting pistion heights. So if you had 100mm x20%= 80mm to set piston height. It also interest me on how the bleed pump automatically sets the piston height on the WPs, never gave it a thought when I saw it being used. Its cool!